Question 675128
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Hi
f(x)=3-6x
 y = 3 - 6x   ||Finding the Inverse (interchanging the x and y )
 x = 3 - 6y'
 6y' = 3-x
 y' = (3-x)/6
f '(9) = (3-9)/6 = -6/6 = -1